To provide a cover for a rigid endoscope and an endoscope unit that allow the cover to be easily attached/detached to/from an outer peripheral surface of the rigid endoscope, reliably prevent a tubular member in which washing fluid flows from slipping out of the rigid endoscope, and prevent leakage of fluid such as the washing fluid from occurring.SOLUTION: A cover 20 for covering a part in a circumferential direction of an outer peripheral surface of a rigid endoscope 10 at a tip of which an observation window part 14 is provided, includes: a flexible outer cover member 22 for covering a part in the circumferential direction of the outer peripheral surface of the rigid endoscope 10； and a tubular member 26 provided inside the outer cover member 22 in which washing fluid to be supplied from a base end side of the rigid endoscope 10 to the observation window part 14 of the rigid endoscope 10 flows. When the outer cover member 22 bends, the outer cover member 22 is caused to be attached to the outer peripheral surface of the rigid endoscope 10.SELECTED DRAWING: Figure 4【課題】カバーを硬性内視鏡の外周面に対して容易に着脱することができ、しかも洗浄用流体が内部で流れる管状部材が硬性内視鏡から外れてしまうことを確実に防止するとともに洗浄液等の液漏れが発生することを防止することができる硬性内視鏡のカバーおよび内視鏡ユニットを提供する。【解決手段】先端に観察窓部１４が設けられた硬性内視鏡１０の外周面の周方向における一部を覆うためのカバー２０は、硬性内視鏡１０の外周面の周方向における一部を覆う、可撓性を有する外側カバー部材２２と、外側カバー部材２２の内側に設けられ、硬性内視鏡１０の基端側から当該硬性内視鏡１０の観察窓部１４に供給されるべき洗浄用流体が内部で流れる管状部材２６とを備えており、外側カバー部材２２が撓むことにより当該外側カバー部材２２が硬性内視鏡１０の外周面に取り付けられるようになっている。【選択図】図４
